Lecture 14: Equine Flashcards
(9 cards)
1
Q
What is sympathetic/parasympathetic tone like in horses?
A
PS tone very high
2
Q
How does horse modify its HR?
A
At AV node
3
Q
What happens to 2nd degree block during exercise?
A
Sinus rhythm restored
4
Q
What is the commonest physiological arrhythmia in the horse?
A
2nd degree AV block
5
Q
How does quinidine fix AF?
A
Prolongs refractory period so abolishes.
6
Q
What class is quinidine?
A
1a
7
Q
What are the side effects of quinidine?
A
prolongs QT so can get ventricular arrhythmias and it is also vagolytic, hypotensive and causes GI ulceration, penile protrusion, stridor etc
8
Q
What is the usual cause of tachydysrhythmias?
A
Secondary e.g. ENDOTOXAEMIA, hypoCa, hypoMg, hypoK, metabolic acidosis
9
Q
Above what HR is suspicious for a tachydysrhytmia?
A
80 (higher than pain)
